Correia, NoéliaMazayev, AndriySchutz, G.A. Martins, J.Barradas, A.2019-11-202019-11-202017-102327-4662http://hdl.handle.net/10400.1/12965As constrained "things" become increasingly integrated with the Internet and accessible for interactive communication, energy efficient ways to collect, aggregate, and share data over such constrained networks are needed. In this paper, we propose the use of constrained RESTful environments interfaces to build resource collections having a network lifetime increase in mind. More specifically, based on existing atomic resources, collections are created/designed to become available as new resources, which can be observed. Such resource design should not only match client's interests, but also increase network lifetime as much as possible. For this to happen, energy consumption should be balanced/fair among nodes so that node depletion is delayed. When compared with previous approaches, results show that energy efficiency and network lifetime can be increased while reducing control/registration messages, which are used to set up or change observations.engInternetThingsConstrained networksConstrained RESTful environments (CoREs) interfacesEnergy savingInternet of Things (IoT)journal article10.1109/JIOT.2017.2678517